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50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
'''
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__author__ = "Ricardo Montañana Gómez"
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__copyright__ = "Copyright 2020, Ricardo Montañana Gómez"
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__license__ = "MIT"
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__version__ = "0.9"
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Plot 3D views of nodes in Stree
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'''
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import numpy as np
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import matplotlib.pyplot as plt
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from mpl_toolkits.mplot3d import Axes3D
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from trees.Snode import Snode
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from trees.Stree import Stree
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class Snode_graph(Snode):
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def __init__(self, node: Stree):
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self._plot_size = (8, 8)
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n = Snode.copy(node)
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super().__init__(n._clf, n._X, n._y, n._title)
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def set_plot_size(self, size):
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self._plot_size = size
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def plot_hyperplane(self):
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# get the splitting hyperplane
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def hyperplane(x, y): return (-self._interceptor - self._vector[0][0] * x
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- self._vector[0][1] * y) / self._vector[0][2]
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fig = plt.figure(figsize=self._plot_size)
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ax = fig.add_subplot(1, 1, 1, projection='3d')
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tmpx = np.linspace(self._X[:, 0].min(), self._X[:, 0].max())
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tmpy = np.linspace(self._X[:, 1].min(), self._X[:, 1].max())
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xx, yy = np.meshgrid(tmpx, tmpy)
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ax.plot_surface(xx, yy, hyperplane(xx, yy), alpha=.5, antialiased=True,
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rstride=1, cstride=1, cmap='seismic')
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plt.title(self._title)
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self.plot_distribution(ax)
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return ax
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def plot_distribution(self, ax: Axes3D = None):
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if ax is None:
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fig = plt.figure(figsize=self._plot_size)
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ax = fig.add_subplot(1, 1, 1, projection='3d')
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ax.scatter(self._X[:, 0], self._X[:, 1], self._X[:, 2], c=self._y)
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ax.set_xlabel('X0')
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ax.set_ylabel('X1')
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ax.set_zlabel('X2')
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plt.show()
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